Reading unsigned int from command line

[Suresh369]

From the command line, I passed a value like this:

a.out -seed 3333333333

But when I did:
unsigned int seed;

seed = atoi(argv[2]);

cout << seed;

it just puts out the decimal equivalent of 0x7fffffff; I cannot change the internal variable to int. Any hints?

[risby]

From the command line, I passed a value like this:

a.out -seed 3333333333

But when I did:
unsigned int seed;

seed = atoi(argv[2]);

cout << seed;

it just puts out the decimal equivalent of 0x7fffffff; I cannot change the internal variable to int. Any hints?

Use strtoul() rather than atoi().

#include <stdlib.h>
unsigned long strtoul(const char *nptr, char **endptr, int base);

[Banfa]

The actual problem is that atoi returns int even though you are assigning the value to unsigned and 3333333333 is outside the range of an int so it has returned INT_MAX = 0x7FFFFFFF